Single-tooth dog for gripping logs.



No. 877,208. PATENTED JAN. 21, 1908. T. MANLEY.

SINGLE TOOTH DOG FOR GRIPPING LOGS.

APPLICATION FILED APR,19.1907,

2 $HEETS-SHEET l.

Witnesses.

UNrrnn S THOMAS MANLEY, OF PRINCE ALBERT, SASKATCHEWAN, CANADA.

SINGLE-TOOTH DOG- FOR GBIPPING-LOGS.

Specification of Letters Patent;

Patented Jan. 21, 1908.

Application filed April '19. win. Serial No. 369.122.

' which the following is the specification.

My invention relates to s ngle tooth dogs, carried by or within the knee of the head block of a saw mill carriage, and ,the objects of the invention are, firstly, to provide dogs which are easily removable from the sup orting frame within the knee in event 0 the breakage of a dog, secondly, to provide a sim le, easily constructed dog which can be ma e with little trouble in the ordinary blacksmiths shop, and lastly,,to provide a framework and operating mechanism for two sets of dogs, whereby when operated, one set is thrown outwardly and downwardly, and the other outwardly and upwardly.

The invention consists essentially of a cen' tralplate or support adapted to slide within the ollow knee of the headlock, the. said late being formed with afacially enlarged ont portion having on the one side a series of similar transverse, arcuate slots or uides, and on the other a similar set of slots wlth the are reversed and further havin on either side a set of horizontal slots ,disposed' between the aforesaid guides, sets of single tooth dogs adapted to slide within the arouate slots, removable side plates retaining the dogs within the guides, a removable vertical arm connecting the individual do s of the respective sets, and means contro led by a lever for throwing the arms forwardly and backwardly, the parts being arranged and constructed as hereinafter more particularly described.

Figure 1 is a persective-view of a headblock carrying a hol ow knee fitted with my invention, a part of the knee bein "broken away to show construction and .t e teeth being shown in the outer position. Fig. 2 is an enlar ed side view of my invention applied wigiin a hollow knee, the side face of the knee'being torn away and portions of the side plate and arm being brokenaway to show construction.

o posite side of the knee being torn away and t e side plate completely removed. Fig. .4 is a side view of a hollow knee fitted with my do s showing a modified form of operating lin to that exposed in the preceding figures.

Fig. 3 is a reverse v1ew of my invention to that shown in Fig. 2, the

Fig. 5 is an end view of the knee showing the center plate, do s, and side plates in position.

Fig. 6 is an en arged, detailed, perspective view of one of the right hand dogs. Fig. 7 is a detailed perspective view of one of the vertical arms.

In the drawings like letters of reference indicate corresponding arts in each figure.

A A represents t 'e framework of the sawmill carriage. I B is a steel girder log seat passing across between the members 'A A and strongly bolted thereto.

C is the headblock slidable .on the log seat and carrying a hollow knee C.

C O are the ordinary lever and quadrant carried by the headblock for throwing the headblock forwardly and backwardly on the log seat, the of this invent1on, and need no further description. p p

D is a central plate adapted to slide within the hollow knee from the rear, the said plate having two facial enlargements D D on either side of the front ed e.

I E are studs extending om either side of the central plate and are designed to allow the center plate to pass easily within the knee. F F, F F are transverse arcuate slots formed within the facial enlargement of the center plate. One of the sets F F has all of the slots arranged with the curve turned downwardly, and the other set F F (on the opposite side of the center plate) has the slots reversed 'or turned upwardly. It is to be noted that the slots are identical, being outlined by arcs of equal radius.

G G are dogs, said dogs bein formed to fit the slots F F respectively, an have their forward end sharpened or pointed and their rear endformed with a stud as at G In this wise the dogs are divided into two sets, there bein what I term'a right hand-set GG, and a left and set G G, and it will further be noted that the studs G extend outwardly from the face of the dog.

H H are bars having 0 enin s H to ad:

mit of the studs G of the ogs, t ere being a bar on either side of the center plate.

G are studs extending outwardly from the. face of the bars and are suflicient in de th to just clear the side faces of theknee, in 's inlposition once they are within the knee.

I are side plates adapted to retain the dogs within the slots the said plates being removably secured to the facial enlargement parts of which form no part way serving to hold the bars H H securely by means of studs I extending therefrom.

When in position the side plates are prevented from loosening by the inner faces of- .the knee; Y

' J J are bosses extending in sets on either side of the center plate, and K. K, K K are sets of bell cranks pivotally supported by the respective sets of bosses. K are pins passing through the boss and hold the ell crank in osition.

-L, L L, are horizontal slotscut in the facial enlargement of the center plate, and; M M,.M ,M are links connecting respectively, one. arm of-each of the bell'cranks to adapted to operate 'backwardly and forthevertical bars H H. The said links are wardly within the slots and the connection between the link and the arm is simply through ai stud extending from the linkinto an opening in the arm. N N are, vertical 'links connecting the remaining arms of the bell cranks in (pairs.

' .being adapts 0 is a ban center plate hav ng its wardly and bifurcated and center plate.

wer end bent in P P are links pivotall'y connecting the. vertical links N N respectively, with the bi- In Fig. 4 I have shown a second form-of link mechanism but-the operation of the andthe dogs themselves-are of the form do s as IIGI'BIHbBfOI'G described. Instead ofa bell crank I have pivoted two sets offstraight arms-RR, one on either side, and to these.

are connected links S S the links S? being pivoted to the links S, and the link S in turn lever controllin pivoted to the handle T fulcru'med at T to the-'headblock C. T'he change from the :bell- "cranks to the straight link simply requires a horizontal pull instead of a vertical lift to throw out-1 the dogs, as will readily be seen in the drawings, I

In some cases the. operator prefers the the dogs to be somewhat back'from the ee. In Fig. 1' this would simply be a matter of addin an extra link between the lower portion -o the handle 0 and a controllin handle operatin further qback on'the head lock, such as at It will be noted that in case of. a dog breaking it is a very simple matter to insert a .new one as neither the side plates nor the vertical arms are riveted in position. To "take out a dogall that it is necessary to dois to undo the screws, and press or pullback,-

wardlyfthe central late whichcarries the dogs. The'barsH 1 and the plates I I can be pulled or. lifted ofi freely and then the le' pivotally supported on the straddling the to retain the center plate in,

eweos broken dog can' be removed. If a supply of dogs is kept on hand the time lost in replacing a broken dog is very small, and this is an I impprtant item. I

hat I claim as my invention is":

.1. In a device of the class described the combination with the knee of a headblock, of

a center plate adapted to slide within] the knee, slidable dogs carried within guides in the'center plate, removable side plates retaining the dogs in the holding the center plate w thin the knee and means for operating the dogs [forwardly and backwardly, as and for the purpose s ecified. 2. In a device ofthe class descri ed the combination with the hollow knee of a headblock, of a center plate adapted to slide within theheadblock, said plate being formed with a facially enlarged front portion having sets of ides cut therein, dogs adapted to slide wit in-the guides, removable side plates retaining the dogs within the guides, means for retaining the center plate within the knee and means for operating the dogs backwardly and forwardly, as and for the purpose specified.

3. In a device of theclass describedthe combination with the hollow. knee of a head block, of acenter late ada ted to slide within the knee, the sai, center p ate being formed with a facially enlarged front portion having on'its sides, respectively, a series'of'similar guides, dogs adapted to slide within the guides, side plates retaining the dogs in position and held to the center plate by studs, a vertical arm pivotally connected to each set. of dogs, means for throwing the arms backwardlyand forwardly, and means for retaining the center plate within the knee, as and 'for the pur 'osespecified.

4. Ina eviceof the class described the combination with the hollowknee of a headblock, offa center plate formed with a faci ally enlarged. front ortion having on one side a series of simi ar transverse arcuate guides, and on the; other a similar set of guides with the are. reversed, sets of dogs adapted to slide within the arcuate guides, removable side plates retaining the dogs within the guides, a-removable vertical arm connecting the individual dogs of. the re spective sets, adjustable means for retaining t e'center late within the knee, and means controlled by a lever for throwing the. arm forwardly and backwardly, as and for the purpose specified,

5. In a device of the class described the combination with the hollow knee of a headblock, of a center. plate formed with a facially enlarged front portion having. on one ides, means for r side a series of simi ar transverse arcuate gu des and on the other a simllar set of guides .with the are reversed, sets of dogs ada ted to slide within the arcuate slots, remova le side plates retaining thedogs within the guides,

' the hol w knee, screws adapted to hold the I center plate withinthe knee and means c0nj trolled by alever for throwing the vertical arm's inwardly and outwardly, as and for the purpose specified r I 6. In a device of the class described; the

combination with the hollow knee of a head- I I block, of a' center-plate formed with a fac'ially enlarged front portion having on one side a r series of similar, transverse ,arcuate guides and on the other a similar set of guides with" the are reversed, sets of dogs adapted to slide within the arcuate guides, vertical arms connecting the individual dogs of the re-' spective sets, a set of links pivotal-1y con-L nected to the vertical arms at their onevend, and operating in slots formed in the facial enlar ement of the center plate, a second set of lin pivotally supported on either si'de of the center-plate and having one of their ends .ating the latteijlinks sothat the vertical connected with the-jfreeend'of the aforesaid links, and means for-connecting-"Tand opereach set of bell cranks and arms with the de endent dogs are thrown backwardly and orwardly, as and for the purpose specified.

- 7. In a device of the class described the .with the are reversed, sets of dogs adaptedto.

slide Within-the arcuate guides, vertical arins connecting the individual dogs of the re-' spective sets, a set of links pivotally connected to the vertical arms at their one end,

andoperating in slots formed in the facial enlargement of. the centre plate, sets of bell cranks pivotally supported on either side of the center late and having one of their arms, respective y, connected to the free end of the aforesaid links, a link joinin the free ends of ks connecting the latter links with the bifurcated end of a lever, as and for the purpose specified.

, Signed atWinnipeg, in the Province of Manitoba, this 12th day of March 1907.

' THOMAS MANLEY.

Witnesses:

M. A. SoMERVILLE,

GERALD S. Roxnnnen. 

